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/*

* Copyright (c) 2006-Present, Redis Ltd.

* All rights reserved.

*

* Licensed under your choice of the Redis Source Available License 2.0

* (RSALv2); or (b) the Server Side Public License v1 (SSPLv1); or (c) the

* GNU Affero General Public License v3 (AGPLv3).

*/

#include "json_encoder.h"

#include "sds/sds.h"

#include "rmalloc.h"

#include "strutil.h"

#include "../value.h"

#include "../query_ctx.h"

#include "../errors/errors.h"

#include "../graph/graphcontext.h"

#include "../graph/entities/node.h"

#include "../graph/entities/edge.h"

#include "../datatypes/datatypes.h"

// Forward declaration

sds _JsonEncoder_SIValue(SIValue v, sds s);

static inline sds _JsonEncoder_String(SIValue v, sds s) {

return sdscatfmt(s, "\"%s\"", v.stringval);

}

static sds _JsonEncoder_Properties(const GraphEntity *ge, sds s) {

s = sdscat(s, "\"properties\": {");

const AttributeSet set = GraphEntity_GetAttributes(ge);

uint prop_count = AttributeSet_Count(set);

GraphContext *gc = QueryCtx_GetGraphCtx();

for(uint i = 0; i < prop_count; i ++) {

Attribute_ID attr_id;

SIValue value = AttributeSet_GetIdx(set, i, &attr_id);

const char *key = GraphContext_GetAttributeString(gc, attr_id);

s = sdscatfmt(s, "\"%s\": ", key);

s = _JsonEncoder_SIValue(value, s);

if(i < prop_count - 1) s = sdscat(s, ", ");

}

s = sdscat(s, "}");

return s;

}

static sds _JsonEncoder_Node(const Node *n, sds s) {

s = sdscatfmt(s, "\"id\": %U", ENTITY_GET_ID(n));

s = sdscat(s, ", \"labels\": [");

// Retrieve node labels

uint label_count;

GraphContext *gc = QueryCtx_GetGraphCtx();

NODE_GET_LABELS(gc->g, n, label_count);

for(uint i = 0; i < label_count; i ++) {

Schema *schema = GraphContext_GetSchemaByID(gc, labels[i], SCHEMA_NODE);

ASSERT(schema);

const char *label = Schema_GetName(schema);

ASSERT(label);

s = sdscatfmt(s, "\"%s\"", label);

if(i != label_count - 1) s = sdscat(s, ", ");

}

s = sdscat(s, "], ");

s = _JsonEncoder_Properties((const GraphEntity *)n, s);

return s;

}

static sds _JsonEncoder_Edge(Edge *e, sds s) {

s = sdscatfmt(s, "\"id\": %U", ENTITY_GET_ID(e));

GraphContext *gc = QueryCtx_GetGraphCtx();

// Retrieve reltype data.

int id = Edge_GetRelationID(e);

Schema *schema = GraphContext_GetSchemaByID(gc, id, SCHEMA_EDGE);

ASSERT(schema);

const char *relationship = Schema_GetName(schema);

ASSERT(relationship);

s = sdscatfmt(s, ", \"relationship\": \"%s\", ", relationship);

s = _JsonEncoder_Properties((const GraphEntity *)e, s);

s = sdscat(s, ", \"start\": {");

// Retrieve source node data.

Node src;

Graph_GetNode(gc->g, e->src_id, &src);

s = _JsonEncoder_Node(&src, s);

s = sdscat(s, "}, \"end\": {");

// Retrieve dest node data.

Node dest;

Graph_GetNode(gc->g, e->dest_id, &dest);

s = _JsonEncoder_Node(&dest, s);

s = sdscat(s, "}");

return s;

}

static sds _JsonEncoder_GraphEntity(GraphEntity *ge, sds s, GraphEntityType type) {

switch(type) {

case GETYPE_NODE:

s = sdscat(s, "{\"type\": \"node\", ");

s = _JsonEncoder_Node((const Node *)ge, s);

break;

case GETYPE_EDGE:

s = sdscat(s, "{\"type\": \"relationship\", ");

s = _JsonEncoder_Edge((Edge *)ge, s);

break;

default:

ASSERT(false);

}

s = sdscat(s, "}");

return s;

}

static sds _JsonEncoder_Path(SIValue p, sds s) {

// open path with "["

s = sdscat(s, "[");

size_t nodeCount = SIPath_NodeCount(p);

for(size_t i = 0; i < nodeCount - 1; i ++) {

// write the next value

SIValue node = SIPath_GetNode(p, i);

s = _JsonEncoder_GraphEntity((GraphEntity *)node.ptrval, s, GETYPE_NODE);

s = sdscat(s, ", ");

SIValue edge = SIPath_GetRelationship(p, i);

s = _JsonEncoder_GraphEntity((GraphEntity *)edge.ptrval, s, GETYPE_EDGE);

s = sdscat(s, ", ");

}

// Handle last node.

if(nodeCount > 0) {

SIValue node = SIPath_GetNode(p, nodeCount - 1);

s = _JsonEncoder_GraphEntity((GraphEntity *)node.ptrval, s, GETYPE_NODE);

}

// close array with "]"

s = sdscat(s, "]");

return s;

}

static sds _JsonEncoder_Point(SIValue point, sds s) {

ASSERT(SI_TYPE(point) & T_POINT);

// default crs == wgs-84 till we support other CRS formats

s = sdscat(s, "{\"crs\":\"wgs-84\",\"latitude\":");

s = sdscatprintf(s, "%f", Point_lat(point));

s = sdscat(s, ",\"longitude\":");

s = sdscatprintf(s, "%f", Point_lon(point));

// height is not supported yet

s = sdscat(s, ",\"height\":null");

s = sdscat(s, "}");

return s;

}

static sds _JsonEncoder_Array(SIValue list, sds s) {

// open array with "["

s = sdscat(s, "[");

uint arrayLen = SIArray_Length(list);

for(uint i = 0; i < arrayLen; i ++) {

// write the next value

s = _JsonEncoder_SIValue(SIArray_Get(list, i), s);

// if it is not the last element, add ", "

if(i != arrayLen - 1) s = sdscat(s, ", ");

}

// close array with "]"

s = sdscat(s, "]");

return s;

}

static sds _JsonEncoder_Map(SIValue map, sds s) {

ASSERT(SI_TYPE(map) & T_MAP);

// "{" marks the beginning of a map

s = sdscat(s, "{");

uint key_count = Map_KeyCount(map);

for(uint i = 0; i < key_count; i ++) {

Pair p = map.map[i];

// write the next key/value pair

s = _JsonEncoder_String(p.key, s);

s = sdscat(s, ": ");

s = _JsonEncoder_SIValue(p.val, s);

// if this is not the last element, add ", "

if(i != key_count - 1) s = sdscat(s, ", ");

}

// "}" marks the end of a map

s = sdscat(s, "}");

return s;

}

sds _JsonEncoder_SIValue(SIValue v, sds s) {

switch(v.type) {

case T_STRING:

s = _JsonEncoder_String(v, s);

break;

case T_INT64:

s = sdscatfmt(s, "%I", v.longval);

break;

case T_BOOL:

if(v.longval) s = sdscat(s, "true");

else s = sdscat(s, "false");

break;

case T_DOUBLE:

s = sdscatprintf(s, "%.15g", v.doubleval);

break;

case T_NODE:

s = _JsonEncoder_GraphEntity(v.ptrval, s, GETYPE_NODE);

break;

case T_EDGE:

s = _JsonEncoder_GraphEntity(v.ptrval, s, GETYPE_EDGE);

break;

case T_ARRAY:

s = _JsonEncoder_Array(v, s);

break;

case T_MAP:

s = _JsonEncoder_Map(v, s);

break;

case T_PATH:

s = _JsonEncoder_Path(v, s);

break;

case T_NULL:

s = sdscat(s, "null");

break;

case T_POINT:

s = _JsonEncoder_Point(v, s);

break;

default:

// unrecognized type

ErrorCtx_RaiseRuntimeException("JSON encoder encountered unrecognized type: %d\n", v.type);

ASSERT(false);

break;

}

return s;

}

char *JsonEncoder_SIValue(SIValue v) {

// Create an empty sds string.

sds s = sdsempty();

// Populate the sds string with encoded data.

s = _JsonEncoder_SIValue(v, s);

// Duplicate the sds string into a standard C string.

char *retval = rm_strdup(s);

// Free the sds string.

sdsfree(s);

return retval;

}